Calculator
RC Time Constant
Find the charging time constant for a resistor-capacitor circuit.
Safety first, always.
ElectroLab AI teaches theory, low-voltage electronics, and planning concepts. Mains voltage, switchboards, fixed wiring, high-current systems, and legal electrical work must only be performed by licensed electricians where required.
Open Safety CenterVisual schematic
RC charge timer
The resistor controls how quickly the capacitor voltage rises. Bigger R or C means a slower timing action.
TP1: supply
TP2: capacitor voltage
TP3: trigger/output
Diagrams are simplified learning models for low-voltage electronics. They are not wiring instructions for mains, switchboards, fixed wiring, or legal electrical work.
Formula notes
tau = R x C
About five time constants gets a capacitor close to fully charged or discharged.
Visual formula bench
RC timing view
One time constant is the first big move; about five time constants is nearly settled.
Live result
0.00 ms
1. Estimate
Load the example or enter a real low-voltage learning value.
2. Visualise
Use the diagram to connect the formula to current path, timing, frequency, or energy flow.
3. Verify safely
Build only suitable low-voltage circuits and confirm with a meter before scaling up.